Palladium-Mediated Ring-Opening Reactions of Strained Cyclotetrasilanes |
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| Authors: | Peter J Miller and Krzysztof Matyjaszewski |
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| Affiliation: | (1) Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania, 15213 |
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| Abstract: | Room-temperature ring-opening polymerization of the strained monomer 1,2,3,4-tetramethyl-1,2,3,4-tetraphenylcyclotetrasilane mediated by palladium complexes was attempted. Examination of the reaction products between the cyclotetrasilane and the metal complex at high concentrations indicated that insertion of one cyclotetrasilane molecule between the ligand–palladium bond was followed by reductive elimination of the tetrasilane. Among the palladium complexes examined were ( 3-allyl)PdCp Cp=5-cyclopentadienyl], (3-allyl) PdCl]2, (3-allyl)PdCl(PPh3), (3-allyl)PdCl(PPh3)2, (3-allyl)Pd(PPh3)3 and PdCl2(PPh3)2. Reaction of 1,1,2,3,4-pentamethyl-2,3,4-triphenylcyclotetrasilane with (3-allyl)PdCp provides similar products. |
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| Keywords: | Polysilylenes ring-opening polymerization cyclotetrasilanes palladium complexes |
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